Question

Ululcllen.
2. Giving an example list two information which make a chemical equation
more useful informative).
3. Name the reducing agent in the following reaction:
3MnO2 + 4A1-
> 3Mn + 2Al2O3
State which is more reactive, Mn or Al and why?
4. (i) Write a balanced chemical equation for process of photosynthesis.
(ii)When do desert plants take up carbon dioxide and perform
photosynthesis?​

Answer 1

Answer:

Chemical equations can be made more informative by the following characteristics:

Physical state

There are three different states which are solid, liquid and gaseous. If the substance exists in solid state, it is represented by (s).

If the substance exists in aqueous state, it is represented by (aq).

If the substance exists in gaseous state, it is represented by (g).

For example:

CaCO  

3

​  

 

heat

​  

CaO(s)+CO  

2

​  

(g)  

Evolution of gas

If the gas is liberated in a reaction, it is indicated by an arrow upward and its physical state is shown by (g).

For example:

Zn(s)+H  

2

​  

SO  

4

​  

(aq)→ZnSO  

4

​  

(aq)+H  

2

​  

(g)↑

Explanation: